#!/bin/bash
#
# Author: Arnold Doray
# Date: 06 Feb 2023
# Compiles Smojo VM (C++) and runs any app.
# Requires C++ compiler.
#
function missing(){
 if [ -z "$1" ]; then
   echo "Missing $2"
   exit 1
 fi
}
CURL=$(which curl)
missing "$CURL" "Curl"
CPP=$(which g++)
missing "$CPP" "C++ compiler"
function help(){
echo -ne "
Usage:
    -c                   -- to grab and compile the latest C++ SmojoVM
    -r username/program  -- to run a program from a user.
    -h                   -- this help.
"
}
TEMP=.
if [ ! -d $TEMP ]; then
   TEMP=$TMPDIR
fi
if [ ! -d $TEMP ]; then
   TEMP=.
fi
function getoptions(){
$CPP -std=c++20 -E -v - < /dev/null > /dev/null 2>&1
if [ $? -eq 0 ]; then
  echo "-std=c++20"
else
  $CPP -std=c++2a -E -v - < /dev/null > /dev/null 2>&1
 if [ $? -eq 0 ]; then
   echo "-std=c++2a"
 else
   echo "-std=c++20"
 fi
fi
}
function compile(){
   cd $TEMP
   $CURL -k https://app.smojo.org/arnold/vm.cpp > vm.cpp
   OPTIONS="$(getoptions)"
   $CPP $OPTIONS -Wall -W -O3 -o smojovm vm.cpp -lcurl
   rm vm.cpp
}
function run(){
   $TEMP/smojovm  https://app.smojo.org/$1.json
}
# Check for smojovm and compile immediately if not found.
if [ ! -f $TEMP/smojovm ]; then
   compile
fi
while getopts chr: flag
do
   case "${flag}" in
       h) help;;
       c) compile;;
       r) run "$OPTARG";;
   esac
done